In pea plants, smooth seeds (S) are dominant over wrinkled seeds (S). A cross is made between a wrinkled-seed variety and a heterozygous smooth-seed variety. The chance of getting offspring homozygous for smooth seeds is
A. 0/4.
B. 1/4.
C. 1/2.
D. 1/1.
A. 0/4.
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Why is a false positive more significant in HIV testing of patients than in screening donated blood for transfusions?
A. It isn't-both are equally dangerous/significant. False-positives in PEOPLE can lead to psychological trauma, but false-positives in BLOOD could lead to the useful blood being disposed. B. A false-positive in a PERSON is easily retestable. This makes it more significant, because we would simply quickly retest the person to verify their actual HIV status. C. A false-positive in BLOOD is easily retestable. This makes it less significant, because we would simply quickly retest the blood to verify its actual HIV status. D. This statement is backwards-false-positives in blood testing are more significant. If the false-positive rate is high and we don't realize it, we're more likely to dispose useful blood. This could lead to acute shortages of blood for patients who need transfusions.
The nucleotides within DNA are composed of a
A. phosphate group, ribose sugar, and nitrogenous base. B. sulfur group, ribose sugar, and nitrogenous base. C. phosphate group, deoxyribose sugar, and nitrogenous base. D. sulfur group, deoxyribose sugar, and nitrogenous base. E. phosphate group, hexose sugar, and nitrogenous base.
In a frog in which the diploid number of chromosomes per cell is 24, what is the total number of chromatids present during prophase I?
a. 4 b. 6 c. 12 d. 24 e. 48
What is the function of the sliding clamp in DNA replication?
a. unwind DNA ahead of the replication fork b. anchor DNA polymerase to the template strand c. remove DNA polymerase from the template strand d. anchor primase to the template strand e. bind to single stranded DNA to stabilize it before it is replicated