The way that genetic material of a bacteriophage enters a bacterium is most like the way that
A) a drug is injected with a hypodermic needle.
B) a person swallows a pill.
C) skin lotion is rubbed onto the hands.
D) water soaks into a sponge.
Answer: A
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The tall ferns that we typically see in the tropics and temperate woodlands are the ________.
A. gametes B. spores C. sporophytes D. gametophytes
Comparison of gene expression in different human tissues using the nuclear run-on transcription assay illustrates that
A) differences in protein production are mainly due to post-transcriptional mechanisms. B) few differences in protein production are detected between tissues. C) differences in protein production are mainly due to differential gene transcription. D) differences in protein production are not due to differential gene transcription. E) few differences in RNA production are detected between different tissues; thus differential protein production is mainly due to post-transcriptional mechanisms.
A bird sanctuary sometimes takes over the care of eggs or chicks of an endangered duck species if the parents are killed. They are sometimes able to use mothers of farm ducks to cross-foster the chicks, but it doesn't always work. Looking at the following data table, what is the critical period for imprinting in this species? (Note: DAH stands for "days after hatching".)Number of chicksAge of chicks when paired with foster motherSuccessful imprinting?(assessed at 14 DAH)?13eggs (0 DAH)yes71 DAHyes113 DAHyes58 DAHno911 DAHno
A. The critical period extends from 1 to 3 DAH. B. The critical period ends sometime between 1 and 3 DAH. We can not determine from this data when the critical period begins. C. The critical period extends from 3 to 8 DAH. D. The critical period ends sometime between 3 and 8 DAH. We can not determine from this data when the critical period begins.
Which of the following statements about the globin gene family is true?
(a) The globin protein, which can carry oxygen molecules throughout an organism's body, was first seen in ancient vertebrate species about 500 million years ago. (b) The gene duplication that led to the expansion of the globin gene family led to the separation and distribution of globin on many chromosomes in mammals, such that no chromosome has more than a single functional member of the globin gene family. (c) As globin gene family members diverged over the course of evolution, all the DNA sequence variations that have accumulated between family members are within the regulatory DNA sequences that affect when and how strongly each globin gene is expressed. (d) Some of the duplicated globin genes that arose during vertebrate evolution acquired inactivating mutations and became pseudogenes in modern vertebrates.