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bulgar [2K]
4 years ago
5

Why are lichen nonvascular?

Biology
1 answer:
marshall27 [118]4 years ago
7 0
They don't have xylem or phloem
extra characters
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We would expect that a 15-nucleotide sequence that includes a stop codon at the end (as part of the 15-nucleotide sequence) will
kirill [66]

Answer:

4 amino acids.

Explanation:

To become translated into protein, a sequence is read in triplets called codons.

Each codon that codes for an amino acid is made up of 3 nucleotides.

Therefore, a sequence of 15 nucleotides would be translated into a polypeptide that is made up of 5 amino acids. (15 divided by 3 = 5)

However, we are told that there is a stop codon at the end of this sequence.

A stop codon is a specialised codon that does not code for an amino acid, but tells the protein machinery that the polypeptide is complete.

Therefore, the polypeptide would have 5-1 amino acids, which corresponds to 4 amino acids.

6 0
4 years ago
The lac operon in E. coli controls the gene expression of the enzymes that digest lactose in the cell. In the absence of lactose
erma4kov [3.2K]

Answer:

b, a, d, c, e

Explanation:

The lac operon is called lactose operon is a cluster of genes with a promoter. The bacteria uses lactose as the source of energy by the proteins coded by genes. This is present in prokaryotes.

The regulatory gene codes for repressor protein. The repressor binds to lactose and prevent its binding to operator. In the absence of lactose repressor gets activated and binds with operator. Thus, RNA polymerase is prevented from binding the promotor. The transcription of genes inhibited. Thus correct order is b, a, d, c, e.

5 0
3 years ago
During dna replication, the two strands separate as the ____________ bonds connecting the parent strands are broken by an enzyme
Setler79 [48]
During DNA replication, the two strands separate as the hydrogen bonds connecting the parent strands are broken by an enzyme called helicase. In the DNA molecule (double strand) complementary bases are joined by hydrogen bonds; that is; Adenine paired to thyamine and guanine to cytosine; during replication the enzyme helicase separates the double helix by breaking the hydrogen bonds between the complementary bases. 
3 0
3 years ago
What can happen to a sedimentary rock once it is formed?
Reika [66]

Explanation:

It can do three things:

1) It can erode/weather to form new sediments that later become a new sedimentary rock.

2) It can undergo heat and pressure changes and become metamorphic rock.

3) It can be melted and solidify into igneous rock.

Once this happens, it can repeat any of these processes.

6 0
4 years ago
Which of the following characteristics of plants is absent in their closest relatives, the charophyte algae?
Phoenix [80]

Answer: d. alternation of multicellular generations

Explanation:

The gametophytic as well as the sporophytic generations are alternative in the life cycle of the multicellular plants. This can be seen among the land plants. This feature cannot be seen in the algal species as they are unicellular in nature. Thus cannot be seen in the relatives of charophyta algae.

3 0
3 years ago
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