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Iteru [2.4K]
4 years ago
12

If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have

Biology
2 answers:
Hoochie [10]4 years ago
3 0
Increased in pitch (frequency). It's the doppler effect.
Lena [83]4 years ago
3 0

Answer choices are:

a. a period higher than the original period.

b. a pitch lower than the original pitch.

c. an amplitude lower than the original amplitude.

d. a frequency higher than the original frequency.

____________________________________________________________

Correct answer choice is:

D. A frequency higher than the original frequency.

____________________________________________________________

Explanation:

This is a true case of Doppler's effect. The Doppler effect can be defined as the effect originated by a traveling source of waves in which there is a visible higher variation in pulse for observers towards what the source is progressing and a visible descending shift in rate for observers from what the source is dropping.


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Find the prokaryotic promoter sequences; Draw boxes around them, Circle the start codon. Then transcribe the following DNA seque
Degger [83]

Explanation:

The transcription is a process which transcribe the DNA into a molecule which could be read by the machinery to translate it into the proteins and that molecule is known as the mRNA molecule.

1.The mRNA molecule is transcribed by an enzyme called RNA polymerase which transcribe DNA in 5'to 3'direction that is DNA strand will be 3' to 5'direction therefore the strand with 3' to 5' will act as template strand.

2. The RNA polymerase binds at promoter region and there are two sequences in prokaryotes at -35 end which is TTGACA and at -10 end which is TATAAT.

3. The translation begins after the start codon which is AUG therefore proteins will be synthesized after AUG.

In the given question, both promoter sequence are present in the 5'to 3'strand

3’GTAACTGTCGAACTACTGTCTACGTCATATTACGCTAATCGATACTGCCTGCATCGATCGTCGACTGCGGTCCGAA

The mRNA will be -

5'- CAUUGACAGCUUGAUGACAGAUGCAGUAUAAUGCGAUUAGCUAUGACGGACGUAGCUUAGCAGCUGACGCCAGGCUU-3'.

There are two start codon thus two polypeptides will be synthesized.

1. met-thr-asp-ala-val

2. met-thr-asp-val-ala-ser-ser

7 0
3 years ago
Geologic time helps explain...
kap26 [50]

Answer:the answer should be Different locations of extinct organisms on earth

Explanation:

4 0
3 years ago
When did the Silurian period occur?
Ad libitum [116K]
I believe the correct answer is A) Silurian period occurred before the Neogene era, because the other answer are wrong.
Hadean eon ended before Silurian period.
Mesozoic and Permian era were after Silurian period.
4 0
3 years ago
A scientist adds a chemical to a dividing plant cell that keeps the cell plate from forming during cytokinesis. The chemical doe
Vadim26 [7]

Answer:

Loss of cell plate formation and production of multinuclear monads.

Explanation:

The inhibition of cell-plate formation during cytokinesis will inhibit the development of the phragmoplast which function as a scaffold for cell plate assembly  and this will not allow for the formation of a new cell wall needed to separate the two new daughter cells leading to loss of cell plate formation and giving rise to multinuclear monads.

7 0
4 years ago
Describe one of the three types of volcanoes we discussed today.
bezimeni [28]

Answer:

The types of volcanoes that I am aware of are dormant, active, and extinct. Active volcanoes are volcanoes that have erupted in the past 10,000 years. Dormant volcanoes are active volcanoes that are supposed to erupt in the future. Extinct volcanoes are volcanoes that have not had an eruption in the last 10,000 years and is not expected to erupt.

6 0
3 years ago
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