Although all protein structures are unique, there are common structural building blocks that are referred to as regular secondary structures. Some proteins have ? helices, some have ? sheets, and still others have a combination of both
What makes it possible for proteins to have these common structural elements?
(a) specific amino acid sequences
(b) side-chain interactions
(c) the hydrophobic-core interactions
(d) hydrogen bonds along the protein backbone
(d) Choices (a), (b), and (c) are factors that contribute to the uniqueness of proteins, but because the protein backbone is a repeating, identical unit, interactions between backbone atoms are something that all proteins can have in common.
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In most species, the sex chromosomes have identical genes along their length
A. true B. false
Why have plants been implicated in the Ordovician and Devonian glaciations, but not the Proterozoic glaciations?
A. Proterozoic plants used anoxygenic photosynthesis. B. Proterozoic plants had simple root structures that did not increase rock weathering. C. Land plants had not yet evolved during the Proterozoic. D. The non-vascular plants present during the Proterozoic did not contribute to global nutrient cycles. 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 glaciation? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
In goats, the gene for coat color is on an autosome and light brown color is dominant to black. A light brown male is mated to a black female, producing a black kid (baby goat). If they produce another kid, could it be light brown? If so, what are the chances of it being light brown?
A. No, since the black allele is present all offspring will be black B. Yes, 100% since the first kid was black the next one has to be light brown C. Yes, 75% since light brown is dominant D. Yes, 50% as the male must be heterozygous for color E. Yes, but it will depend on whether the kid is male or female
The variable phenotypic expression shown in camptodactyly results from the interaction of ____________________
and ________________factors.Fill in the blank(s) with the appropriate word(s).