The density of Comet Halley was found to be about 0.2 g/cm3 . This implies that Comet Halley
a. is composed of about 50% rock and 50% frozen water and methane.
b. is loosely packed ices with a small amount of rocky material.
c. formed in the inner solar system and was ejected by Jupiter to the Kuiper belt.
d. is really an S-type asteroid.
e. was once a moon of Neptune and was ripped away by a large impact.
b
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The mineral particles in soil include all of the following except ________
a. silt b. humus c. sand d. clay
Ultimately, the signal from a peptide hormone is typically conveyed to the effectors in the cell via the transfer of what molecular moiety?
A. nucleotide B. NO (nitric oxide) C. H2O D. phosphate group E. amino acid Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about peptide receptors? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The ABO blood types have ____ different
genotypes.
a. 4 b. 6 c. 8 d. 12 e. 16
Scientists have developed bioengineered crops that are more resistant to damage by frost, chemicals, and drought. Crops have been bioengineered also to produce larger crop yields. What is a potential drawback to increased use of bioengineered crops?
A) a loss of genetic variation B) increased disease resistance C) lower food costs D) decreased food supply