Unscrewed vehicles designed to travel around the surface of a planet while collecting data are called what?

1 answer:

8 0

The correct answer is letter D. Rovers are vehicles tat are designed to travel the surface of a particular planet. These vehicles are actually designed to collect data and specimen that can be studied by scientists back here on Earth. These rovers can be designed to collect rocks, dust, and even take pictures.

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Which of the following structures is the most complex in organization? (biggest, most

alisha [4.7K]

Organ system is the most complex in organization

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3 years ago

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If thymidine dimers created by UV irradiation persist until DNA replication, DNA polymerase is likely to make a mistake reading

marishachu [46]

Answer:

Thymidine dimers is likely to be repair as soon as it is originated but if left unrepaired then it causes frame shift mutations.

Explanation:

In case of Bacterium if UV irradiation induces covalent linkage of two thymidine present adjacently to each other or on a single strand to make thymidine dimers.

These either excised via DNA repair enzyme like Endonuclease V and the proof reading activity of DNA polymerase I enzyme help in incorporation of nucleotide by taking the unmutated original strand as a template.

These dimers if not excised before second round of replication than the sequence of newly synthesized strand will be altered. As DNA polymerase III enzyme read thymidine dimers as single thymidine nucleotide and incorporate only 1 adenine in the newly synthesizing complementary strand which results in frame shift mutations

It is the mutation in which reading frame of codons is shifted or altered due to deletion or addition of a single nucleotide.

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Results of research showing that auditory hallucinations are localized in the expressive speech area of the brain suggest that:

zepelin [54]

The results from the research suggest that a person who experiences auditory hallucinations that are localized in the expressive area of the brain is actually listening to his or her own thoughts. Since the problem is in the expressive area, this shows that the patient is only listening to the ideas his brain is already producing.

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3 years ago

How does mitosis cause an offspring to have the same DNA as it’s parents?

dsp73

<span>Mitosis cause an offspring to have the same DNA as it’s parents because</span> the last phase in Mitosis is Telephase, produces two diploid daughter cells, identical to the parent cell.

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4 years ago

Number the following steps in the correct order and tell which stage it occurs in:

zimovet [89]

Answer:

d. Genetic material replicates and is joined at the centromere ----- INTERPHASE

b. Chromosomes line up at the equator and chromatids are attached to spindle fibers---- METAPHASE

e. Centromeres divide and single-stranded chromosomes move to the poles ---- ANAPHASE

c. Nuclear membrane and nucleolus reappear ---- TELOPHASE

a. A cleavage furrow or cell plate forms, separating the nuclei ---- CYTOKINESIS

Explanation:

This question depicts the events that occur in the cell cycle. The cell cycle begins with the preparatory phase called INTERPHASE and stops at the cytoplasm division called CYTOKINESIS. The correct order of the options in this question are:

1. D - The genetic material (DNA) replicates at the Interphase stage, specifically the Synthesis phase. The DNA replication is one of the steps the cell takes during the Interphase to prepare itself for division. The replication of DNA forms a structure called SISTER CHROMATIDS, which are replicated chromosomes held at the Centromere.

2. B - After the Interphase stage, comes the actual division (Mitosis). This option shows what occurs in the Metaphase stage of Mitosis. The spindle microtubules attaches to the kinetochore of each chromosome (sister chromatids) and they become aligned at the equator/middle of the cell.

3. E -- This option shows the occurrences in the Anaphase stage of Mitosis. The aligned chromosomes are separated and pulled apart towards opposite poles of the cell by the spindle fibres. Each pole contains a single strand chromatid of a pair. This is actually the essence of the replication process in Interphase stage.

4. C -- After the division of the nuclear material (chromosomes), a process called KARYOKINESIS, the important structures begin to reform in each pole of the cell during the Telophase stage. Prior to separation of chromosomes at the Anaphase stage, the membrane that bounds the nucleus called NUCLEAR MEMBRANE alongside the nucleolus is degraded in order for the spindle microtubules to assess the chromosomes. These structures form at each pole during Telophase stage.

5. A -- After karyokinesis (division of nuclear material), the cytoplasmic content of the cell needs to separate into two in a process called Cytokinesis. Cytokinesis occurs differently in plant and animal cells. Plant cells forms a cell plate due to their cell wall while Animal cells form a cleavage furrow at the equator of the cell.

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3 years ago