AS Level Biology A H020/02 Depth in biology Tuesday 6 June 2017 - Afterno
Study online at https://quizlet.com/_bjzbvj
1. Cell B in Fig. 1.1 was observed using an organelles can be seen in more detail
electron microscope. Give one piece of
evidence from Fig. 1.1 that supports this
2. Give one way that an image produced laser scanning confocal microscope has lower
by a laser scanning confocal microscope resolution
differs from that produced by an electron
microscope
3. Meiosis is a type of nuclear division. Fig. prophase (1)
1.2 shows a photomicrograph of plant
cells undergoing meiosis
identify the stage of meiosis 1 shown in
the cell labelled A
4. Based only on your observations of chromosomes condense
Fig.1.2, state two reasons for your an- chromosomes still not aligned at the equator
swer in (b)(i)
5. Another stage of meiosis is metaphase 1. independent assortment
Explain how the organization of homolo- chromosomes line up at the Centre of the
gous chromosomes during metaphase 1 equator
increases genetic variation each chromosome of the homologous pair is
genetically different
6. Xylem and phloem are two vascular tis- Similarity- both made up of cells joined end to
sues found in plants. end
State one similarity and two differences Difference- xylem pits- phloem- no pits
between the structure of xylem and Difference- xylem lignified- phloem-not ligni-
phloem fied
Difference- xylem no sieve tube elements-
phloem sieve tube elements
1/3
Study online at https://quizlet.com/_bjzbvj
1. Cell B in Fig. 1.1 was observed using an organelles can be seen in more detail
electron microscope. Give one piece of
evidence from Fig. 1.1 that supports this
2. Give one way that an image produced laser scanning confocal microscope has lower
by a laser scanning confocal microscope resolution
differs from that produced by an electron
microscope
3. Meiosis is a type of nuclear division. Fig. prophase (1)
1.2 shows a photomicrograph of plant
cells undergoing meiosis
identify the stage of meiosis 1 shown in
the cell labelled A
4. Based only on your observations of chromosomes condense
Fig.1.2, state two reasons for your an- chromosomes still not aligned at the equator
swer in (b)(i)
5. Another stage of meiosis is metaphase 1. independent assortment
Explain how the organization of homolo- chromosomes line up at the Centre of the
gous chromosomes during metaphase 1 equator
increases genetic variation each chromosome of the homologous pair is
genetically different
6. Xylem and phloem are two vascular tis- Similarity- both made up of cells joined end to
sues found in plants. end
State one similarity and two differences Difference- xylem pits- phloem- no pits
between the structure of xylem and Difference- xylem lignified- phloem-not ligni-
phloem fied
Difference- xylem no sieve tube elements-
phloem sieve tube elements
1/3
