When a muscle fiber is relaxed, why can’t
myosin bind to actin?
a. ATP is not present
b. the myosin binding site on actin is blocked
c. the myosin head is in the wrong shape for
binding
d. the actin is in the wrong orientation for
myosin binding
e. the myosin head is 180 degrees from its
attachment configuration
B
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Cancer cells ____
a. maintain telomerase function b. have longer telomeres than normal cells c. eventually die due to shortening chromosomes d. have circular chromosomes e. cannot replicate their DNA
Which of the following is a tumor suppressor gene?
a. p21 b. p57 c.RB3 d. Cdk
One of the laws Mendel established is the law of independent assortment. Assume that a parent has the genotype Aabb and that this parent produces gametes. Which of the following illustrates the letter or letters that could be present in one of these gametes according to the law of independent assortment?
A) AB B) ab C) A D) Aa
Why do the same trans-regulatory elements lead to very different morphology in different species of organisms?
A. Different species have genetic codes that use different codons, leading to different amino acid sequences. B. Morphological change depends on sequence mutations in enhancers. C. These regulatory elements have no effect on morphology, only metabolism. D. The transcription factor activates different combinations of enhancers and downstream genes. E. The trans-regulatory elements in different lineages have independently evolved the same sequence, by convergent evolution.