🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →
Log in
Biology
3
answers
0
watching
317
views
26 Mar 2019

1) How do animals keep from digesting themselves?

2) What are the biological advantages of internal versus external fertilization and internal versus external development of the embryo?(internal/extrnal fertilization) and (internal/external develpment of embryo)

3) Why are eggs and sperm so different in size. What functions can you infer from their structure?

4) Why do humans crave fatty foods?

Watch
3
answers
0
watching
317
views

For unlimited access to Homework Help, a Homework+ subscription is required.

Unlock all answers

Get 1 free homework help answer.
Already have an account? Log in
Share
Already have an account? Log in
Share
Keith Leannon
Keith LeannonLv2
27 Mar 2019
Already have an account? Log in
Share

Related textbook solutions

Molecular Cell Biology
8 Edition,
Lodish
ISBN: 9781464183393
Biology: Science for Life with Physiology
6 Edition,
Belk
ISBN: 9780134555430
Biology
2nd Edition, 2013
Openstax
ISBN: 9781947172517
Concepts of Biology
OER Edition,
Openstax
ISBN: 9781938168116
Essentials of Biology
5 Edition,
Mader
ISBN: 9781259660269

Related questions

23. During meiosis, one way that diversity is achieved is throughthe differential ways maternal and paternal
chromosomes line up at the equator. This phenomenon is knownas:
A. Crossing under; B. Random mating; C. Crossing over; D. Randomshuffling
24. What is the correct order of classification from the leasttraits in common to the most traits in common?
1. Order; 2. Genus; 3. Kingdom; 4. Species; 5. Phylum; 6. Family;7. Class
A. 3,5,1,7,2,6,4; B. 3,7,5,6,1,2,4; C. 3,5,7,6,1,4,2; D.3,5,7,1,6,2,4; E. None of the above 25. Humans are currentlyclassified as Homo sapiens. An earlier human ancestor was Homoerectus. Please
identify the Genus of the earlier human ancestor. A. sapiens; B.Homo; C. Human; D. erectus
26. Whales utilize which type of fertilization? A. Internal; B.External; C. Terrestrial; D. None of the above
27. During internal fertilization, sperm are deposited directlyinto the female’s body in order to protect the
gametes. In some female animals, after the sperm fertilizes theeggs, the eggs continue to develop inside the
female, and the developing embryos receive ALL of their nourishmentfrom the mother. These animals are
considered to be: A. Oviparous; B. Viviparous; C. Precocial; D.Ovoviviparous
28. In humans, which gender has separate openings for the urinaryand reproductive systems?
A. Men; B. Women; C. Both A and B; D. None of the above
29. An animal’s anatomical structures can be used to constructphylogenetic trees. What is the term given to the
structures of two animals whereas the structures are very similarbut have different functions? Ex: Forearm of a
human and the wing of a duck:
A. Vestigial Structures; B. Analogous Structures; C. HomologousStructures; D. None of the above
30. Humans have 46 chromosomes in every somatic cell nucleus. Thereare 23 chromosomes from mama and
23 chromosomes from papa. Chromosome #3 from mother and Chromosome#3 from father contain
information to control the same genetic traits. During meiosis 1,duplication of chromosomes results in 2 copies
of chromosome #3 from the father and 2 copies of chromosome #3 fromthe mother. The pair of chromosomes
#3 from the father are refered to as:
A. Sister chromatids; B. Centromeres; C. Homologous chromosomes; D.Spindle apparatus

1. A plant the lacks petals and has well-developed anthers ismost likely

pollinated by fruit-eatingmammals.
pollinated by bees.
pollinated by birds.

pollinated by wind.

2. SELECT EACH TYPE of tissue that may be found in a maturefruit or seed. Can be more than one

Diploid sporophyte tissue from theprevious generation
Triploid endosperm
Diploid embryonic tissue
Haploid sperm cells

Tissue from the female gametophyte

3. Based on the outcome for plants, a monkey eating a banana isa

parasite.
pollinator.
disperser.

fertilizer.

4. Select all of the environmentswhere seeds would be an advantage over spores. Can be more thanone

Deserts
Areas with unpredictablerainfall
Wet humid swamps
Open habitats with sparsevegetation

Under a dense forest canopy

5. Select all the advantages that seeds have over spores.

Seeds have increased droughtresistance.
Long term dormancy ispossible.
Sexual reproduction is onlypossible with seeds.
Nutrition is packaged with theembryo.

Widespread dispersal is possible with a seed coat.

6. Nectar is a sugar-laden liquid that is very energeticallyexpensive to produce. Why do plants allocate resources to produceit instead of just producing more flowers?

Nectar serves as an enticement forinsects.
Nectar is sticky and traps windborne pollen.
Nectar provides nutrition to thedeveloping embryo.

Nectar provides energy during pollen tube formation.

7.The dried pericarp that forms the peanut shell provideevidence that peanuts are

legumes.
drupes.
samaras.

pomes.


8. All members of the Anthophyta have

nectaries.
animal pollinators.
scented flowers.
ovules enclosed in carpels.

fleshy fruits for dispersal.

9. Why is external water not essential for fertilization in seedplants?

Ovules are contained within thepollen.
Sperm cells are used to transportpollen to the archegonia.
Seed plants use pollen instead ofsperm for fertilization.
The sperm cells in seed plants arecapable of resisting desiccation.

Pollen grains are transported by wind or an animal.

10.Select the true statements concerning seeds. Can be more thanone

Seeds allow for dormancy untilfavorable conditions arise.
The fruit provides nutrition to thedeveloping embryo.
The ovule dries and forms the seedcoat.
The seed stores all of thenutrition and water the embryo needs to germinate.
Seeds can resist conditions thatwould kill a live plant.

Seeds are key to wide dispersal of offspring.

11. Select the true statements concerning sperm and pollen. Canbe more than one.

In seed plants the entire malegametophyte is dispersed.
The pollen fertilizes the egg.
The pollen tube facilitates thepollination of the ovule.
Pollen transports the cells thatform the sperm but only the sperm fertilizes the egg.

Unlike mosses and ferns water is not needed for fertilization inseed plants.

12.Check which of the following are correct regarding thebenefit of seeds. Can be more than one.

Seeds protect the young embryo byenclosing it in several layers of gametophyte tissue.
Seeds provide a source ofnourishment to the embryonic plant.
The integument forms a seed coatthat protects against desiccation.
Seeds provide a structure in whicha dormant embryo can avoid unfavorable growing conditions andgerminate when conditions improve.

Seeds are a means to transport offspring away from the parentalplant.

13. A fruit-bearing dioecious flower would have

a gynoecium.
neither an androecium nor agynoecium.
an androecium.

both an androecium and a gynoecium.

14. A researcher brings a sample of dry soil to the lab, wetsit, provides ample amounts of fertilizer, and places the soil in acontainer in a greenhouse. Which type of plant would be leastlikely to emerge?

Corn
Sunflower
Liverwort
Wheat
Pine seedling

**For each answer, explain why when possible.**

1.) Cats contain a chromosome # of 2N=38. How many chromosomeswould be located in a maturing sperm in a feline testis, assumingthat the sperm has entered Meiosis II?

-76
-19
-38
-32

2.) A sperm is small and an egg is large. Why could this be? Canchoose more than one answer.

-Eggs need to be able to move completely outside of the mother forfertilization.
-Eggs are stationary and contain a supply of proteins, mRNAs,stored energy etc of the embryo-to-be.
-Sperm are motile, sometimes traveling considerable distances (on acellular scale).
-Twins will results from eggs that have the same genetic materialoriginally.

3.) Tons of organisms have evolved sex as a means of reproduction.Why? Tough question, choose the one most sensible answer.

-Sex helps an organism reproduce faster than any othermethod.
-Sex allows greater genetic variation in a population.
-Sex allows a species to mutate more accurately.
-Sex speeds up the rate of natural selection on a mutation.

4.) Zoonotic diseases are diseases that can be spread from otheranimal species to us. In this part of the lab we'll be taking somereasonable precautions to make sure that we don't allow unduecontact between their parasites and the interior of our bodies. Whyare we more vigilant about zoonotic diseases for the Gametogenesislab?

-The samples are fresh (they were part of a living organism just aday before)
-The samples are from mammals, so their parasites are closerevolved to us
-We are using sharp tools and razor blades, making access into ourbloodstream potentially easier
-The samples are from warm-blooded animals which have similardiseases to ours

5.) Echinarachnius parma (the common sand dollar) releases largeamounts of sperm and oocytes into the water. To avoid wasting spermwhenever possible, these gamete cells will not self-fertilize. Thismeans that you (Choose one):

-Will need to use sperm and eggs from different individuals inorder to successfully fertilize the oocytes.
-Can use room temperature conditions.
-Don't need to worry where the oocytes came from.
-Should focus your microscope as quickly as possible.

Related Documents

BIO 242
Final Exam
Study Guide
BIO 242 Study Guide - Final Guide: Pancreatic Juice, Bile Acid, Salivary Gland
coffeemacaw615
BIO310H5 Chapter 9: Glands and Hormones
salmonotter107
BIO 311D Lecture Notes - Lecture 15: Hox Gene, Horizontal Gene Transfer, Sea Level Rise
ultramarinegoose457

Weekly leaderboard

Home
Homework Help 3,900,000
Biology 460,000
Start filling in the gaps now
Log in