Sister chromatids are best described as two DNA molecules that have ______________
A. the same genes in the same order but that
have different alleles.
B. the same alleles of the same genes in a
different order.
C. different genes in the same order and
possibly have different alleles of some genes.
D. different alleles of the same genes
arranged in a different order.
E. virtually identical sequences of
nucleotides.
E
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Aquaporins are ____
a. pores made of water molecules b. required for water to enter a cell c. found only in bacterial cells d. specific channels for water transport e. useful for cell signaling
If a normal diploid germ cell in a bird has eight chromosomes, then ______
a. there are eight homologous pairs of chromosomes per diploid germ cell b. there are eight chromatids per diploid germ cell after DNA replication c. there are four chromosomes per cell after the first meiotic division and cytokinesis d. there are eight chromosomes in the sperm cells made from this diploid germ cell e. there are eight copies of each chromosome in this diploid germ cell
__________ sense pain. Fill in the blank(s) with the appropriate word(s)
An organism that lives in a deep marine environment may exhibit all the following physical characteristics, except
A) large eyes. B) bioluminescence. C) colorful skin pigmentation. D) streamlined body.