A retrovirus produces an enzyme called reverse transcriptase, which copies the R
ID: 267917 • Letter: A
Question
A retrovirus produces an enzyme called reverse transcriptase, which copies the RNA genome into the DNA of the host. This process is the opposite of the central dogma of DNA because:
a retrovirus mutates too much to follow the central dogma of DNA.
a retrovirus lacks RNA.
the central dogma states that DNA is copied into RNA.
a retrovirus cannot exist in human cells
Which of the following is most correct regarding genes, DNA, and protein?
A gene is a section of a chromosomal DNA composed of many amino acids.
DNA is composed of many genes, which are formed from amino acid sequences
DNA is composed of many amino acids, which encode the protein and genotype
A gene is a section of DNA whose sequence encodes a particular protein, which is composed of amino acids.
If the sequence of one strand of a DNA molecule is 5' ATGGCAT 3', the sequence of the complementary strand would be:
5' ATGGCAT 3'
3' ATGGCAT 5'
5' TACCGTA 3'
3' TACCGTA 5'
Interphase consists of:
mitosis and cytokinesis
S, G2, and prophase
G1, S, G2
prophase, metaphase, anaphase, and telophase
cell cycle
The DNA of dizygotic twins is:
identical in the number and distribution of alleles, but not necessarily identical in gene sequence
different in the number and distribution of alleles, but identical in gene sequence
identical in the number and distribution of alleles, and identical in gene sequence
as alike as the DNA of any two full-siblings
X inactivation is controlled by:
the XIST gene
the SRY gene
the XTASY gene
the INACT gene
In genomic imprinting, the expression of a genetic disorder depends on:
the age of the mother when she became pregnant
whether the trait is X-linked or autosomal
the number of autosomal genes transmitted
which parent transmits the disease-causing allele
Greg experiences severe withdrawal symptoms when he stops taking hydrocodone which is a drug he originally took to alleviate his leg pain, but hasn't been able to quit. Greg is exhibiting:
tolerance
paranoia
ideation
dependence
Explanation / Answer
Please find the answers below:
Answer 1: the central dogma states that DNA is copied into RNA (according to the central dogma of molecular biology, DNA leads to generation of RNA which is translated into proteins. This order of events is not followed by retroviruses and hence they present exception from it)
Answer 2: A gene is a section of DNA whose sequence encodes a particular protein, which is composed of amino acids (The DNA is a segment of the gene, which is transcribed and translated into protein. Proteins contain amino acids as their monomers)
Answer 3: 3' TACCGTA 5' (DNA replication takes place in opposite direction of 5' to 3' polarity that too in complementary base pairing)
Answer 4: G1, S, G2 (the interphase represents the phase of cell cycle in which the cell prepares itself for division)
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