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morpeh [17]
3 years ago
7

Which of these organelles is not made of or surrounded by a membrane

Biology
1 answer:
Ahat [919]3 years ago
5 0
A Ribosome is not a membrane bound organelles
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The lab setup shows four test tubes. Tube 1 contains water only. Tube 2 contains a live snail. Tube 3 contains a live green wate
nirvana33 [79]

Answer: D

Explanation:

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2 years ago
Which main-sequence on the Hertzsprung-Russell diagram are the least massive?
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The Hertzsprung-Russell diagram is one of the most important tools in the study of stellar evolution. Developed independently in the early 1900's by Ejnar Hertzsprung and Henry Norris Russell, it plots the temperature of stars against their luminosity (the theoretical HR diagram), or the color of stars against their absolute magnitude

Depending on its initial mass, every star goes through specific evolutionary stages dictated by its internal structure and how it produces energy. Each of these stages corresponds to a change in the temperature and luminosity of the star, which can be seen to move to different regions on the HR diagram as it evolves. This reveals the true power of the HR diagram – astronomers can know a star’s internal structure and evolutionary stage simply by determining its position in the diagram.

The Hertzsprung-Russell diagram the various stages of stellar evolution. By far the most prominent feature is the main sequence (grey), which runs from the upper left (hot, luminous stars) to the bottom right (cool, faint stars) of the diagram. The giant branch and supergiant stars lie above the main sequence, and white dwarfs are found below it.

3 0
3 years ago
Read 2 more answers
A researcher has developed two stains for use with seed plants. One stains sporophyte tissue blue; the other stains gametophyte
sukhopar [10]

Answer:

A) The pollen grains will be pure red.

Explanation:

Plants have alternation of generations, this means that there are two different stages in their life-cycle: a sexual haploid (n) phase and an asexual diploid phase (2n). These phases occur in different individuals, so there is an haploid plant called gametophyte that carries gametes and after fecundation, it will rise a diploid sporophyte (asexual).  

In seed plants, the sporophyte is the plant that we normally see, and the gametophyte is reduced into an organ of the sporophyte. The male gametophyte is the pollen that is produced in the sporangium in anthers (parts of sporophyte).  When a pollen grain fecundes a female gametophyte (egg), it will produce a diploid embryo or new sporophyte.

Therefore, if the researcher exposes pollen to both stains, these grain will stain red, because red stain identifies gametophyte tissue.

3 0
3 years ago
If you were an Astronaut in the middle of the near side of the moon during a full moon, how would the ground around you look? Ho
zubka84 [21]
  However, It would be bright all around. All though the Apollo astronauts that went there, it wasn't as bright as say a desert on Earth but more like an asphalt parking lot.
6 0
2 years ago
When her parents first hung the new mobile over her crib, Hannah paid a great deal of attention to it. But as time passed, Hanna
gtnhenbr [62]

Answer:

habituation

Explanation:

Habituation is a kind of learning process in psychology, which describes the behavioral responsiveness of humans and animals to a stimulus that is presented repeatedly without a change, punishment or reward. It explains that response of humans and animals to a stimulus that is repeatedly presented will reduce over time. The more the repetition, the less response is exhibited.

Hannah is simply exhibiting a lesser degree of responsiveness to the repeated occurrence of same stimuli which is termed habituation.

4 0
3 years ago
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