When phage ? enters the lytic cycle
A. many new copies of the phage genetic material and coat proteins are assembled to make new phages. The host cell is lysed
B. many new copies of the phage genetic material and coat proteins are assembled to make new phages. The host cell remains intact.
C. the genetic material of the phage is integrated into the chromosome of the bacterium.
D. it immediately lyses the host cells without producing any new viruses.
A
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In Drosophila melanogaster, the gene for eye color is located on the X chromosome. The allele for red eye color
(Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find both red-eyed females and white-eyed females as well as both red-eyed males and whiteeyed males. The genotypes of the parents were ____.
a. Xw+Xw+; XwY b. Xw+Xw; XwY c. XwXw; Xw+Y d. Xw+Xw; Xw+Y e. XwXw; XwY
Respond to statements 121–125 with reference to the five
components of the gastrointestinal tract listed below. a. stomach b. gallbladder c. small intestine d. appendix e. large intestine D 121. It has no function in human digestion, but it does in other animals. D 122. This organ absorbs about 95 percent of the water that enters the human body, either as fluids or as part of food being eaten. M 123. Enzymatic digestion of proteins occurs primarily in this organ. E 124. Bile salts, bile pigments, cholesterol, and lecithin are stored by this organ. E 125. The digestion of cellulose occurs in this part of the digestive system of the pronghorn antelope.
An individual mixotroph loses its plastids, yet continues to survive. Which of the following most likely accounts for its continued survival?
A) It relies on photosystems that float freely in its cytosol. B) It must have gained extra mitochondria when it lost its plastids. C) It engulfs organic material by phagocytosis or by absorption. D) It has an endospore.
How do bulk flow and diffusion interact to enable respiratory systems to deliver oxygen quickly to all cells of the body?
What will be an ideal response?