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What does it mean that viruses are acellular?
Deduce and explain the effects of mutations:
a) in the operator, so that the repressor is no longer able to bind.
b) in lacI, so that the repressor is no longer synthesized.
c) in the promoter, so that RNA polymerase no longer binds.
d) in lacI, so that the repressor no longer binds to lactose.
e) in lacY that causes transcription to terminate in the middle of the gene.
f) location unknown, which prevents the lac mRNA from being degraded.
Mitochondrial encephalomyopathy, lactic acidosis and stroke-like episodes (MELAS) is a mitochondrial inherited disorder due to deficiency of either NADH/COQ reductase (Complex I cytochrome oxidase (Complex IV). Due to this lack of a functional mitochondria, what would the net ATP produced from one molecule of glucose? 6+2=8.
A. 0
B.1
2
D. 4
E. 8
A biology class was performing an experiment in the lab. The students had obtained a DNA strand with radioactive thymine. Later as they left the strand in a medium for multiplication, they realized that the radioactivity was observed only in part of the DNA and not all DNA molecules.The process was explained by the teacher as:
Why can't normal hydrogen bonding with nitrogenous bases of DNA occur when the molecule is in duplex/helix form?
- How do the endoplasmic reticulum and the Golgi bodies interact within an animal cell? (3 marks)
- How is light important to a) plants, and b) animals? Give two different, specific examples for each type of organism. (4 marks)
- Five major events in the history of life are listed below. Place these events in the (hypothesized) correct sequence of events, from earliest to most recent, in the evolution of life on Earth. Explain why you have placed each in that particular sequence. (5 marks)
A. Origin of chloroplasts
B.Origin of multicellular eukaryotes
C.Origin of mitochondria
D.Origin of aerobic heterotroph bacteria
E.Origin of animals
4.Explain how the endomembrane system, chloroplasts, and mitochondria are all
thought to have originated from ancient prokaryotes. What is the name of this
hypothesis, and what evidence supports it? (8 marks)
5.Compare and contrast (i.e. describe the similarities AND differences between) a
generalized animal cell and a generalized plant cell. (10 marks)
how many lysosomes does one human liver contain?
Why are some ferns described as bioaccumulators of metals and
metalloids?
What other different organisms may have similar body structures?
The maternal part of the placenta. Hemochorial barrier
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#339914 on Dec 2023