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16 Feb 2019

If one is testing a goodness of fit to a 9:3:3:1 ratio, how many degrees of freedom would be associated with the Chi-square?

1

2

3

4

not enough information to determine

Which of the following choices does not describe a type of posttranslational modification of proteins?

The amino terminal methionine may be removed.
Glycoproteins are produced by the attachment of phosphates to newly synthesized proteins.
Precursor proteins are cleaved and trimmed by protease enzymes to produce a functional protein.
Molecular chaperones help proteins fold correctly.
Amino acids in the amino terminal of the protein can be acetylated.

A eukaryotic DNA sequence that affects transcription at distant promoters is called a(n)

long distance promotor
regulator
operon
enhancer

DNA methylation may be a significant mode of genetic regulation in eukaryotes. Meythylation refers to

altering RNA polymerase activity by adding methyl-groups
changes in DNA-DNA hydrogen bonding
altering translation activity via methylated tRNAs
adding methyl groups to certain cytosines in DNA

If a nucleotide lacks a 3’-OH group, what will happen?

it’s transformed into RNA
another nucleotide can bond at the 3’ site during replication
replication will halt
no effect

Which of the following describe posttranscriptional modifications commonly seen in mRNA of eukaryotes?

5’ capping, 3’-poly-A tail addition, splicing
3’ capping, 5’ poly-A tail addition, splicing
heteroduplex formation
5’ capping, 3’polyA tail addition, removal of exons

In birds, females are the heterogametic sex. This means that

females have chromosomes in pairs.
emales produce eggs.
females determine the gender of their offspring.

males have two identical sex chromosomes (ZZ)

An anticodon on a tRNA has the sequence 5'–GCA–3'. What would be the effect on translation if the G in the anticodon were mutated to a U?

The anticodon could pair to the serine codon 5'–UCA–3', and a cysteine would be incorporated at all points where a serine should have been incorporated.
The anticodon could pair to the threonine codon 5'–ACU–3', and a threonine would be incorporated at all points where a cysteine should have been incorporated.
The anticodon could pair to the serine codon 5'–AGU–3', and a serine would be incorporated at all points where a cysteine should have been incorporated.
The anticodon could pair to the stop codon 5'–UGA–3', and instead of stopping translation, a cysteine would be incorporated and translation could continue.

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Hubert Koch
Hubert KochLv2
16 Feb 2019

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