The first level of compaction of DNA consists of
A) DNA winding around histones to form small nucleosomes.
B) tight coiling of DNA with nucleosomes into higher order structures.
C) compaction into metaphase chromosomes.
D) histone, DNA, and nonhistone covalent bonding.
A) DNA winding around histones to form small nucleosomes.
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The seabirds with an ecological role similar to land-based hawks, falcons, and vultures are the:
a. gulls and terns. b. skuas and jaegers. c. avocets and sandpipers. d. curlews and turnstones. e. eiders and puffins.
One of the major characteristics of life is reproduction. There are two types of reproduction: asexual and sexual reproduction. Compare the advantages and disadvantages of both types of reproduction. What do you think is the benefit of sexual reproduction that makes it so much more prevalent among living things?
What will be an ideal response?
Imagine you are working in the laboratory. You have just raised 15g of water 1 degree Celsius. How many Calories of energy did you utilize to heat the water in this procedure?
A. 0.07 B. 70 C. 0.0015 D. 0.015 E. 1.5 F. 15
What may be a new source that could replace embryonic stem cells for therapeutic purposes?
What will be an ideal response?