Which of the following is/are true of most of the extreme thermophilic Archaea in the phylum of Crenarchaeota?
A. They are acidophiles
B. Their cell walls contain lipoprotein and carbohydrate
C. They are sulfur dependent
D. Unlike most other Archaea, their membrane lipids are similar to those of the bacteria
E. They are sulfur dependent, they are acidophiles, and their cell walls contain lipoprotein and carbohydrate
Answer: E
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a. actin c. both b. myosin d. neither
What is a reason that aneuploidy in sex chromosomes is generally better tolerated than aneuploidy in autosomal chromosomes in humans?
A) In somatic cells, most of the genes on only one X chromosome are transcriptionally active. B) Autosomal aneuploidy leads to heart defects and death in utero. C) Y chromosome duplication results in only minor changes in testosterone levels. D) Sex chromosome aneuploids may occur as the result of fertilization, but extra sex chromosomes are removed from the developing embryo during subsequent mitosis. E) Any change in autosome number results in increased susceptibility to infection.
An albatross spending its life hovering over the ocean provides an extreme example of __________, the process by which animals control solute concentrations and balance water gain and loss.
a. osmoregulation b. hydration c. evaporation d. osmosis e. excretion
Which of the following statements about RNA splicing is false?
(a) Conventional introns are not found in bacterial genes. (b) For a gene to function properly, every exon must be removed from the primary transcript in the same fashion on every mRNA molecule produced from the same gene. (c) Small RNA molecules in the nucleus perform the splicing reactions necessary for the removal of introns. (d) Splicing occurs after the 5? cap has been added to the end of the primary transcript.