You have conscious control over
A) muscles that propel urine from the kidney to the bladder.
B) the external urethral sphincter.
C) muscles that cause the bladder to contract.
D) the internal urethral sphincter.
B
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In lateral growth, the _________ is the source of new xylem and phloem, whereas the _________ renews and maintains the outer layer that protects the stem
A. cork cambium; vascular cambium B. vascular cambium; cork cambium C. secondary vascular tissue; primary vascular tissue D. sapwood; heartwood E. apical meristem; lateral meristem
The tryptophan codons of the attenuator sequence help speed up transcription of downstream trp genes at high concentrations of tryptophan
Indicate whether the statement is true or false
In differentiating fungi from plants and animals, which of the following statements is NOT true?
A. The energy reserve of fungi is starch while the energy reserve of animals is glycogen. B. Plants have cell walls of cellulose; fungi have cell walls of chitin. C. Animals are heterotrophic by ingestion while fungi are heterotrophic by absorption. D. Fungal spores develop into haploid hyphae; in animals, haploid gametes combine to form a diploid organism.
Comb shape in chickens represents one of the classic examples of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose comb (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive
condition (rrpp) produces the single comb. Assume that a rose-comb chicken is crossed with a walnut-comb chicken and the following offspring are produced: 17 walnut, 16 rose, 7 pea, and 6 single. What are the probable genotypes of the parents? A) rrPP × RRpp B) rrpp × RrPp C) Rrpp × RrPp D) RRPP × Rrpp E) RrPp × RRPP