What type of regulatory transcription factor binds DNA and increases the transcription of a gene?
A. a repressor exerting negative control
B. a repressor exerting positive control
C. an activator exerting negative control
D. an activator exerting positive control
E. a combination of both a repressor and activator exerting negative control
D. an activator exerting positive control
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A woman heterozygous for color blindness (an X-linked recessive allele) marries a man with normal color vision. What is the probability that their first child (male or female) will be color blind?
A. 25% B. 50% C. 75% D. 100% E. 0%
Are viruses living or nonliving? Explain.
What will be an ideal response?
What is the fundamental difference between covalent and ionic bonding?
A) In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other. B) In covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not. C) Covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell. D) Covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements.
During which phase of a microbial growth curve is the population growing fastest?
A. Log phase B. Death phase C. Lag phase D. Stationary phase