Which of the following is not a way nucleosome formation affects DNA?
A. compacts the DNA in the nucleus
B. alters access to DNA by enzymes
C. regulates the rate of DNA replication in mitochondria
D. inhibits transcription by the internucleosome connections mediated by histone tails
E. competes with transcription factor Sp1 to maintain transcriptional repression
C
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The gametophyte of a fern is
(a) haploid. (b) photoautotrophic. (c) a structure that produces eggs and/or sperm. (d) all of the above.
In Arabidopsis, the floral meristem is organized into four concentric whorls of cells, each of which gives rise to a specific organ of the mature flower. The floral meristem is therefore analogous to what cells or tissues in animals?
A. totipotent stem cells B. cells in the morula C. the inner cell mass of the blastula D. the germ layers of the gastrula E. None of these choices is correct.
Parental care of offspring:a
for many animals has a lower cost than benefit. b. results in a decreased probability that each offspring will survive. c. is more common in species in which the female produces two or more times during a breeding season. d. is more common among male animals than among females. e. is more common among male fishes than among females.
During inflammation, blood vessels are constricted to prevent leakage.
Answer the following statement true (T) or false (F)