Which of these human sex chromosome genotypes is not possible?
A. XXY
B. XXXY
C. XXX
D. YYYY
Ans: D. YYYY
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Striated muscles appear striated or banded under a microscope. Striated muscle fibers include (Choose all correct answer options):
A. skeletal muscle B. muscles of cnidarians C. smooth muscle cells D. cardiac muscle cells
Which of the following best describes the structure of how water molecules form and interact?
a. Hydrogen atoms bond with each other to create a stable outer shell of electrons. Then they form a hydrogen bond to an oxygen atom to create the water molecule. b. Oxygen atoms transfer one electron to each of the hydrogen atoms, forming an ionic bond that attracts other water molecules to it. c. The oxygen atom and hydrogen atoms form a covalent bond with one another to create stable outer shells of electrons. d. The electrons are shared unequally resulting in a polar molecule whose slight charges form weak hydrogen bond attractions with other water molecules. e. Hydrogen bonds are formed between the two hydrogen atoms and the oxygen atom. This water molecule then forms a covalent bond with adjacent water molecules. f. The oxygen atom is more electronegative than the two hydrogen atoms. Due to this, it removes the electron from each hydrogen atom. This satisfies the outer shell of oxygen. Then hydrogen bonds form between the two remaining hydrogen atoms to hold them near to the oxygen atom.
In a comparison of birds and mammals, having four limbs is _____
A) a shared ancestral character B) a shared derived character C) a character useful for distinguishing birds from mammals D) an example of analogy rather than homology
Using single-cell RNA sequencing a clinician can now determine ________ in one experiment instead of two?
A) heterozygosity B) gene expression and protein levels associated with those genes C) ratio of genes present to the expression levels of those genes D) whether the organism is transgenic or not