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2 years ago

4 easy biology questions !! please helppp!!! **attachments provided

Biology

1 answer:

FromTheMoon [43]2 years ago

6 0

Answer:

1) [J] Sand dollar, 2) [G] Ants and grasshoppers, 3) [A], 4) [G]

Explanation:

Please don't be mad if I'm wrong on a few I'm in AP Environmental Science so I'm kind of keen on this stuff but still I'm trying to help!

You might be interested in

The ratio of estrogen to progesterone remains constant throughout pregnancy into labor. false/true

Lady_Fox [76]

False,

In order to start labor, estrogen increases and progesterone decreases.

Estrogens are a class of hormones that are essential for women's healthy sexual and reproductive development. They are sex hormones as well. The majority of estrogen hormones are produced by a woman's ovaries, however minor quantities are also produced in modest amounts by the adrenal glands and fat cells.

Progesterone is a member of the progestin drug class (female hormones). By lowering the level of estrogen in the uterus, it functions as a component of hormone replacement treatment. By substituting for the natural progesterone that some women lack, it helps to initiate menstruation.

To know more about pregnancy, click on the below link,

brainly.com/question/14353919

#SPJ4

5 0

2 years ago

Animals cannot produce enzymes to digest cellulose, yet many termite species consume cellulose from plant material as a main par

Aliun [14]

The correct answer is mutualistic bacteria in the hindgut of the termite digest the cellulose into sugars.
<span>
Termites depend upon the whole complex of microbes in their hindgut. Microbes inside the termites help the breakage of the complex sugars like a cellulose into short-chain fatty acids.</span>

7 0

3 years ago

The yellow ring inside the bacterial cell represents the bacterial DNA. Why does this structure disappear by step 3 of the lytic

adell [148]

Answer:

The bacterial DNA gets degraded at step 3 of the viral lytic cycle.

Explanation:

Viruses are organisms that are incapable of replicating on their own, hence, they require a living host which they infect and use its replicational ability to reproduce theirselves. The infection cycle of this virus is regarded as its replication cycle. Viruses employ either the LYTIC or LYSOGENIC cycle for infection.

The lytic cycle involves killing of their host cell at the end of the cycle. Generally, the cycle starts with the attachment of my the virus to the cell membrane of its host using specific receptor sites (step 1). It then penetrates the host cell as seen in step 2.

After penetration, the virus then secretes certain degrading enzymes called ENDONUCLEASES that degrades the bacterial DNA. After which the virus uses the replicational and gene expressing ability of the host to transcibe its genetic material and replicate itself. This process called SYNTHESIS occurs in step 3.

Hence, the yellow ring in the image that represents bacterial DNA disappears in step 3 (synthesis stage) because it gets degraded by viral digesting enzymes.

6 0

3 years ago

ESP 7

nekit [7.7K]

1.pagsayaw 2.pagkanta 3.pagtula 4.pagrap. 1.pagguhit 2.pagsulat 3.pagbabasa 4.pagkalat ng balita. di ko na alam young Paano mo pinagyayaman sana makatulong

5 0

3 years ago

Muscle contraction occurs in a cyclic process. Write down its sequence in the correct order?

Airida [17]

Options are not provided in the question. The complete question is:

Muscle contraction occurs in a cyclic process. Which of the following sequences is in the correct order?

A. power stroke, cross bridge formation, cross bridge dissociation, cocking of myosin

B. cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin

C. cross bridge formation, cross bridge dissociation, cocking of myosin, power stroke

D. cross bridge formation, power stroke, cross bridge dissociation, power stroke, cocking of myosin

E. cross bridge formation, cocking of myosin, power stroke, cross bridge dissociation

Answer: B. cross bridge formation, power stroke, cross bridge dissociation, cocking of myosin

Explanation:

Muscle contraction is the activation of sites that produce stress within the muscle fibres.

The process of contraction begins with the Calcium ions that bind to the protein complex troponin and reveal the active-binding actin sites. The high-energy myosin head fills the gap, creating a cross-bridge, until the actin-binding sites are exposed. The filaments shift roughly 10 nm towards the M line as the actin is removed which leads to power stroke because it is the phase at which force is generated. Then teh ATP binds to the myosin and allows the bridge between actin-myosin dissociate. So soon so myosin attaches to actin, myosin's cocked head releases the actin fibre to slide. The cross-bridge generates energy, and actin displaces the myosin cross-bridge reaction products (ADP and Pi). This allows the process of contraction.

Hence, the correct order is B.

3 0

3 years ago