Which risk factors are associated with cancer of the colon and rectum?

Question 1 2.5 / 2.5 points

Hypophosphatemia (vitamin D-resistant rickets) is inherited as a sex-linked dominant trait. The relevant gene is found on the X chromosome. What is the expected outcome of a cross between a homozygous recessive woman and a man with hypophosphatemia?

Question options:

All of their daughters and none of their sons exhibit hypophosphatemia.

Fifty percent of their daughters and fifty percent of their sons exhibit hypophosphatemia.

All of their sons and none of their daughters exhibit hypophosphatemia.

Twenty-five percent of their offspring exhibit hypophosphatemia.

Question 2 2.5 / 2.5 points

In humans, the presence or absence of dimples is a trait controlled by a single gene. What is the genotype of an individual who is heterozygous for dimples?

Question options:

Question 3 2.5 / 2.5 points

Which of these techniques could tell you how gene expression differs between individuals with and without cystic fibrosis?

Question options:

Therapeutic cloning

DNA microarray

Reproductive cloning

Karyotyping

Question 4 2.5 / 2.5 points

Which of these is most likely to cause the development of a six-legged frog?

Question options:

Mutation of homeotic genes

Artificial selection

Dietary supplementation

Conversion of a proto-oncogene to an oncogene

Question 5 2.5 / 2.5 points

Which of the following turns off transcription by binding to the operator?

Question options:

RNA polymerase

Repressor

Promoter

Lactose

Question 6 2.5 / 2.5 points

The region of DNA where RNA synthesis begins is the:

Question options:

start codon.

promoter.

initiator.

processor.

Question 7 2.5 / 2.5 points

The absence of a terminator in transcription will result in:

Question options:

the creation of a virus.

a strand of mRNA that lacks its cap and tail.

the production of a longer RNA molecule.

the production of a shorter RNA molecule.

Question 8 2.5 / 2.5 points

Which of the following enzymes is responsible for RNA synthesis?

Question options:

RNase

RNA helicase

RNA ligase

RNA polymerase

Question 9 0 / 2.5 points

Reproductive cloning can:

Question options:

reacquire the genes it lost during the course of development.

come from an early stage of embryonic development.

be differentiated.

be implanted in the egg of an organism that is capable of regenerating lost body parts.

Question 10 2.5 / 2.5 points

A couple has two female children. What is the probability that their next child will be male?

Question options:

25%

50%

33%

67%

Question 11 2.5 / 2.5 points

Where is translation accomplished?

Question options:

Lysosomes

Smooth endoplasmic reticulum

Ribosomes

Nucleoli

Question 12 2.5 / 2.5 points

In eukaryotic cells, repressor proteins inhibit transcription by binding to:

Question options:

silencers.

enhancers.

regulators.

operators.

Question 13 2.5 / 2.5 points

A mating between a purebred purple-flowered pea plant and a purebred white-flowered pea plant would produce a(n):

Question options:

purebred variety.