An important mineral ion that is a component of chlorophyll and serves as a stabilizer of membranes and ribosomes is ________.
A. calcium
B. magnesium
C. zinc
D. potassium
E. iron
Answer: B
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Researchers have suggested that all live-born infants with Turner syndrome are actually ____________________, with both 46,XX and 45,X cells present in their bodies
Fill in the blank(s) with correct word
Which of the following statements is NOT part of Darwin's theory of natural selection?
a. There is some variation within a population. b. Competition between populations increases variation. c. Individuals with advantageous characteristics tend to survive. d. Survivors pass their advantageous characteristics to their offspring. e. Most species overproduce offspring.
A part of the promoter, called the TATA box, is said to be highly conserved in evolution. Which of the following might this illustrate?
A. The sequence is transcribed at the start of every gene. B. Any mutation in the sequence is selected against. C. The sequence does not mutate. D. The sequence is found in many but not all promoters. E. The sequence evolves very rapidly.
Several members of the same family were diagnosed with the same kind of cancer when they were unusually young
Which one of the following is the most likely explanation for this phenomenon? It is possible that the individuals with the cancer have _______________________. (a) inherited a cancer-causing gene that suffered a mutation in an ancestor's somatic cells. (b) inherited a mutation in a gene required for DNA synthesis. (c) inherited a mutation in a gene required for mismatch repair. (d) inherited a mutation in a gene required for the synthesis of purine nucleotides.