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kobusy [5.1K]
3 years ago
13

Which of the following statements best describes bacteria?

Biology
1 answer:
zubka84 [21]3 years ago
3 0

Answer:

d. Genes that play a role in the same metabolic pathway are organized into an operon.

Explanation:

In prokaryotic organisms like bacteria, polycistronic mRNAs exist which means that each gene does not have a separate promoter of its own. In fact many genes are under the control of a single promoter. These genes being a part of same metabolic pathway are organized into an operon. For example, lac operon and tryptophan operon. In lac operon, three genes named as β-galactosidase, permease and transacetylase are expressed under a single promoter which is known as lac promoter.

In contrast to this, in eukaryotes the mRNAs are monocistronic i.e. only a single gene is controlled under a single promoter.

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Which type of cell is most likely to have the most mitochondria? muscle cells in the legs of a marathon runner nondividing cells
MatroZZZ [7]

Answer:

muscle cells in the legs of a marathon runner

Explanation:

Mitochondria are the powerhouse of cells and serve as a site for the aerobic stage of cellular respiration. Cellular respiration is complete oxidation of nutrients in the presence of oxygen to produce a large number of ATP molecules. Therefore, the cells that require more ATP molecules as an energy source would most likely have a greater number of mitochondria.

Muscle cells are responsible for body movement. Muscle cells in the legs of a runner would require a constant supply of ATP during running since muscle contraction requires ATP. To sustain the continuous muscle contraction during the marathon, the muscle cells in the legs of the runner would have most number of mitochondria.  

5 0
3 years ago
A diseased cell is no longer able to produce proteins. Which cell structure is most likely malfunctioning?
IRINA_888 [86]

Answer:

The ribosomes

Explanation:

Ribosomes are the organelle that produce proteins within eukaryotic and prokaryotic cells- taking information from the DNA in order to produce proteins.

Other organelles may be held responsible for the lack of protein production, but in this case it is most likely the ribosome.

4 0
3 years ago
Plants inherit genes that enable them to produce chlorophyll, but this pigment is not produced unless the plants are exposed to
lozanna [386]
Plants inherit genes that enable them to produce chlorophyll, but this pigment is not produced unless the plants are exposed to light. this is an example of how the environment can influence on gene expression.  
<span>
Light has an important role in gene expression in plants by producing a number of light-induced changes. One of the examples of the light effects is that chlorophyll and the proteins required for assembling the photosynthetic apparatus are synthesized together with the enzymes needed for carbon fixation. Gene expression influenced by light includes the regulation at the level of transcription or, alternatively regulation of translation.</span>
6 0
3 years ago
Object that stores bile in the body is known as what
snow_lady [41]
I believe the best answer is the gallbladder.
I hope this helped 
3 0
3 years ago
Read 2 more answers
In which domain is the bottom of the DNA-binding cleft? What type of secondary structure lines the bottom of the cleft? In which
Archy [21]

Answer:

The bottom of the cleft is in the palm domain. It is lined with beta sheet.

Explanation:

During DNA synthesis, a single DNA strand is being built in by polymerization of nucleotides. These polymerization process is catalyzed by enzymes called DNA polymerase. These DNA polymerase can be visualized as an open right hand which is composed of a thumb domain, a finger domain and a palm domain. The palm domain contains a prominent beta-sheet that forms a plate at the button of the DNA-binding cleft.

8 0
3 years ago
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