#Question id: 100
#Unit 1. Molecules and their Interaction Relevant to Biology
Which of the following contain NeuNAc residues and sulfated sugars, and their negative charges contribute to the viscosity of mucins.
#Question id: 16326
#Unit 7. System Physiology – Animal
#Question id: 11724
#Unit 6. System Physiology – Plant
At the subcellular level, starch is stored in amyloplasts in
the endosperm of cereals. Two enzymes responsible for initiating starch
degradation are α- and β-amylase
a) α-Amylase hydrolyzes starch chains internally to produce
oligosaccharides consisting of α(1,4)-linked glucose residues
b) β-Amylase degrades these oligosaccharides from the ends to
produce maltose, a disaccharide
c) α-Amylase degrades these oligosaccharides from the ends to
produce maltose, a disaccharide
d) α-Amylase
hydrolyzes starch chains internally to produce oligosaccharides consisting
of β(1,4)-linked glucose residues
e) β-Amylase also converts maltose to glucose
Which of the following combination from the above statements is correct?
#Question id: 24270
#Unit 4. Cell Communication and Cell Signaling
#Question id: 805
#Unit 1. Molecules and their Interaction Relevant to Biology
miRNAs are encoded in the genome as segments of longer transcripts. Their characteristic structure helps identify them and predict the target genes they might regulate. Which of the following are the characteristic features of these small RNA molecules?
I. The functional form of an miRNA is typically 21 or 22 nucleotides (it can vary from 19 to 25 nucleotides).
II. The first cleavage liberates the stem-loop, called the pre-miRNA; the second generates the mature miRNA from the pre-miRNA.
III. The pre-miRNAs can be encoded by any part of a transcript: that is, they might fall within coding regions, within leader regions, or within Introns.
IV. The base pairing between miRNA and target RNA is initiated by interactions of so-called seed residues—the sequence between bases 2 and 9 of the 22-nucleotide miRNA.