Sensory receptors respond to a novel stimulus with a:
A. high firing rate.
B. low firing rate.
C. initially high firing rate.
D. initially low firing rate.
A
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Gene regulation is referred to as combinatorial control when:
A. some transcription factors are common to the regulation of multiple genes. B. some transcription factors are unique to the regulation of a single gene. C. certain transcription factors are only used for initiation of transcription of housekeeping genes.
What are the adaptations plants have to adapt to life on land?
What will be an ideal response?
The law of segregation states that
A) when two identical alleles come together, complete dominance occurs in terms of phenotype. B) genes for different traits assort independently of each other during the formation of egg and sperm. C) genes separate from each other during gamete formation so that each sperm and egg receive only one allele from each pair. D) when different alleles for the same trait come together, one allele will be recessive to another. E) different alleles for the same gene occupy unique loci on sister chromatids.
Which part of a hemoglobin molecule binds to a molecule of O2?
A. The surface of an ? globin chain B. The copper atom wedged between an ? and a ? globin chain C. The iron atom in the center of a heme group D. The surface of a ? globin chain E. The hydrophobic pocket between two ? chains