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3 years ago

How many chromosomes do both reproductive cells (gametes) *

Biology

1 answer:

vodka [1.7K]3 years ago

7 0

Human gametes, or sex cells, are haploid cells that contain 23 chromosomes

Explanation:

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Which of the following phrases best describes climate?

Ronch [10]

The answer would be the third choice: it is usually dry. Climate is the usual weather conditions in a specific area.

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2 years ago

Read 2 more answers

Put the steps of zygomycete sexual reproduction in the right order. Start with the production of multinucleate gametangia at the

Vesnalui [34]

Answer:

Choice 4 of 5. Hyphae produces multinucleate gametangia

Choice 1 of 5. Gametangia fuse

Choice 2 of 5. Karyogamy occurs and zygosporangium develops

Choice 5 of 5. A dark, thick-walled zygospore develops

Choice 3 of 5. Meiosis occurs to produce haploid spores

Explanation:

The steps of zygomycota sexual reproduction are;

Germination step; Hyphae produces multinucleate gametangia

Plasmogamy step; Gametangia fuse when compatible mating types of mycelia are brought close to each other by the formation gametangia between

The fusion of the nuclei results in the formation of zygosporangium that has multiple haploid nuclei and a thick wall

Karyogamy step; A zygote having multiple diploid nuclei is formed by the fusion of nuclei

Germination and Meiosis step; The sporangia grows and haploid spores are produced

Therefore, we have;

Choice 4 of 5. Hyphae produces multinucleate gametangia

Choice 1 of 5. Gametangia fuse

Choice 2 of 5. Karyogamy occurs and zygosporangium develops

Choice 5 of 5. A dark, thick-walled zygospore develops

Choice 3 of 5. Meiosis occurs to produce haploid spores

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2 years ago

The antibiotic rifampicin blocks transcription in many bacteria. In the presence of the antibiotic, adding sigma factor has no s

mariarad [96]

Answer:

transcription initiation

Explanation:

Transcription is a process by which genetic information from DNA is used to synthesize an RNA molecule, usually, a messenger RNA (mRNA), which is subsequently utilized to synthesize a protein by a process called translation. Transcription in prokaryotes has three steps:

1-Initiation: the RNA polymerase is a multisubunit enzyme (holoenzyme) composed of two α, one β, one β’ and one ω and σ subunits (α2ββ’ωσ). This holoenzyme binds to the promoter region of the template DNA strand.

2-Elongation. The sigma σ factor of the holoenzyme is released and the complex and the core enzyme (α2 ββω) moves along the template strand, thereby producing an mRNA sequence

3-Termination. This step can be Rho-dependent, where a protein named "Rho" recognizes the termination site and stop transcription, and Rho-independent (transcription continues until the termination sequence is reached).

In consequence, Rifamycin is likely to block the initiation of transcription because the core RNA enzyme needs to bind the sigma factor (σ) for initiation of transcription in bacteria.

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3 years ago

In a biology lab exercise, you are asked to examine cells of a growing onion root tip, that has been sectioned to show many cell

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Because the chromatin condenses into compacted chromosomes.

During mitosis, chromatin condenses starting from the prophase to the end of cell division. Condensation of chromatin protects the DNA during cell division and facilitate its mobility and transport.

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3 years ago

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2 years ago