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Homework Help for Biology (page 2678)

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Biology

In dideoxy sequencing method,only one primer is used in each reaction tube during DNA synthesis. Why not use both forward and reverse primers in the same tube simultaneously, as in PCR?

Answered
4 Jan 2018
Biology

1) Density-independent factors may alter birth rates ____.

A but never death rates
B in both small and large populations
C in populations as individuals increase in number

2) Many antibiotics work by inhibiting the synthesis of peptidoglycan, a component of the bacterial cell wall. Which of the following could potentially be a similar target for anti-fungal drugs? (there aren't any real drugs that actually target this fungal feature, but 1 class of anti-fungals does target fungi unique synthesis pathways for different membrane components)

A inhibiting the synthesis of cellulose in fungi
B inhibiting the synthesis of chitin in fungi
C inhibiting the synthesis of peptidoglycan in fungi
D inhibiting the synthesis of lignin in fungi

3) In which lifecycles are spores produced through meiosis? (select ALL correct answers)

A plant-like lifecycle in protists and land plant lifecycle (i.e., the sporic lifecycle, or the alternation of generations)
B

the fungal lifecycle (i.e., for most lineages but not the Chytrids and unknown in Microsporidians and Glomeromycetes)

C animal-like lifecycle in protists (i.e., gametic)
D fungi-like lifecycle in protists (i.e., the zygotic lifecycle)

Answered
2 Jan 2018
Biology

2. Describe the current 3-domain system of classification and explain why it replaced the old 5-kingdom system. Explain the major differences between these two taxonomic systems.

Answered
3 Jan 2018
Biology

The power generated during the vertical jump test depends on which metabolic pathway to generate ATP

Answered
4 Jan 2018
Biology

A man with prostate cancer has his prostate removed, and only his prostate removed. Which of the below statements is TRUE about the man after prostate removal?

-Fluid from the bulbourethral glands will not be added to the ejaculate because it is only released after input of fluid from the prostate.

-All of these statements are true

-His fertility will decrease because the ejaculate will not be basic enough to counteract the acidic environment of the female vagina.

-His fertility will decrease because there will not be enough seminal fluid produced to carry the sperm from the epididymis into the vas deferens.

Answered
1 Jan 2018
Biology

A. Explain the reason why the cell requires a mechanism for identifying specific sequences of DNA.

B. On average, how often would the nucleotide sequence CGATTG be expected to occur in a DNA strand 4000 bases long? Show your work and explain your answer.

C. Molecular processes depend upon sequence-specific interactions of proteins with DNA. Recognition sequences can be 4, 5, 6, 7, or even 8 base pairs in length for a single protein. What might be the advantages of a short recognition sequence? What might be the advantage of a longer recognition sequence?

Answered
2 Jan 2018
Biology

Often, people who smoke cigarettes are more susceptible to the effects of toxic chemicals. Explain the basis for this observation from a toxicology perspective

Answered
2 Jan 2018
Biology

Please read this article http://www.sciencedaily.com/releases/2013/08/130828131841.htm and express your opinion of this type of article. What use is this information? Explain....

Answered
2 Jan 2018
Biology

What is the Hormonal-Side Effect hypothesis as it applies to Hyenas, and what are some problems with it? Is it the likely answer for the female hyena pseudopenis or is there another more likely possibility? If so, what is it?

Answered
1 Jan 2018
Biology

The wikipedia article on the dopamine transporter gives examplesof some drugs whose effects are mediated by the inhibition of thedopamine transporter, such as cocaine and amphetamines. Are thereany drugs or substances whose mechanism of action involvesincreasing the activity of the dopamine transporter, i.e., a "DATreleaser?"

Answered
2 Jan 2018
Biology

Why is DNA double stranded and not single stranded?
Answered
4 Jan 2018
Biology

1. In the flour moth, Ephestia, pigment production in eyes of moths depends on a pair of nuclear alleles, A and a. The A allele directs production of a diffusible substance that his involved in pigment synthesis. This substance diffuses from a heterozygous or homozygous dominant mother into all her young, enabling them to synthesize the final pigment. All progeny of a dark-eyed female have dark eyes initially. As the moths age, only those with an AA or Aa genotype can make the diffusible substance for themselves and continue to produce pigment. Without the diffusible substrate, pigment is no longer produced and the eyes lighten with age. What eye color do you expect in young progeny, and then as they age, from each of these crosses? a) Female AA X Male AA b) Female AA X Male Aa c) Female AA X Male aa d) Female Aa X Male AA e) Female Aa X Male Aa f) Female Aa X Male aa g) Female aa X Male AA h) Female aa X Male Aa i) Female aa X Male aa

Answered
1 Jan 2018
Biology

The water-transporting cells of xylem tissue are tracheids and vessel members?

How is the structure of tracheids similar to the structure of vessel members?

How is the structure of tracheids different from the structure of vessel members?

How is the structure of both tracheids and vessel members related to their ability to serve as efficient water-conduction cells?

Sieve tube members are the conducting cells of phloem, specialized for the transport of metabolites within a plant. In what way do sieve tube members differ from a "typical" plant cell?

How do these differences improve the ability of sieve tube members to serve as efficient metabolite-conducting cells?

What is a companion cell, and what is its function?

To what tissue system does each of the following belong - tracheids, vessel members, sieve tube members, and companion cells?

The epidermis is a primary dermal tissue and the periderm is a secondary dermal tissue. Describe the most common cell types found in each of these tissues.

Both the epidermis and the periderm need to perform the same basic functions. What are those functions?

How does the structure of the epidermis contribute to those functions?

How does the structure of the periderm contribute to those functions?

What are guard cells?

How does the structure of guard cells differ from the structure of other epidermal cells?

What is the function of guard cells?

What are trichomes? What functions might trichomes perform?

What is a lenticel?

Describe its structure and function. Describe, in detail, the arrangement of primary tissues in a dicot stem. How does the arrangement of tissues in a monocot stem compare to that of dicot stems – how is it the same, how is it different?

The cortex region and the pith region of a dicot stem typically have different functions. What is the most common function of each region?

What type of tissue is each composed of?

In what types of plants does secondary growth occur?

In what plant organs does secondary growth occur?

Describe where lateral meristems form at the start of secondary growth in a stem.

Describe how the single layer of vascular cambium can produce both secondary xylem and secondary phloem.

What is wood?

bark?

early wood vs. late wood?

What allows the different layers of growth occurring each year to be visible to the human eye?

What is the function of mesophyll tissue?

What are the two types of mesophyll tissue in a typical dicot leaf?

How do these differ from each other with respect to location within the leaf, cell arrangement,

Answered
4 Jan 2018
Biology

Which of the following DNA sequences most likely represents the recognition sequence of a restriction endonuclease? [2 pt; L2; I.A.3]

c a g g a c

c t g c a g

t a g g t a

c c t c c t

Answered
3 Jan 2018
Biology

Read the article "Local and latitudinal variation in abundance: the mechanisms shaping the distribution of an ecosystem engineer" by Gregory M. Crutsinger1, Ange ́lica L. Gonzalez1, Kerri M. Crawford2 and Nathan J. Sanders3

Website https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3709108/

1.What is the hypothesis of the paper?

2.Is this a correlative or causative study? Explain

Answered
4 Jan 2018
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